| Pos. | Spare part number | Name |
| 1 | - | Press to select Radio, CD or AUX mode. |
| 2 | - | Click to increase volume |
| 3 | - | Press to decrease volume |
| 4 | - | Press and release to scroll through preset radio stations or CD tracks. Press to seek forward or backward to the next or previous radio station/CD track |
The audio unit is controlled by resistive multi-link type switches. These switches are connected to the infotainment control module (ICM) or the on-board audio module (IAM) (depending on the audio unit level) via a clock spring.
For more information, please refer to the chapter: Audio System (415-01, Description and Function).
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